Cornwall to Montreal, Canada Marine Forecast, Warnings and Alerts

Canada

N.America Satellite

Canada Radar

Current Conditions

Canada 7 Day High and Low Temperatures Forecast

10 Day Forecast

Lightning Danger Radar

Lightning Strikes Radar

Cornwall to Montreal

Marine Forecast

Issued 09:04 AM EST 20 December 2025

Today Tonight and Sunday.

Gale warning in effect.

Wind southwest 15 knots backing to southeasterly 10 to 15 early this evening then increasing to southwest 15 to 25 near midnight. Wind increasing to west 25 to 35 Sunday morning then diminishing to northwest 15 to 25 Sunday evening.

Scattered flurries tonight and Sunday morning. Visibility 1 mile or less in flurries.

Temperatures minus 6 rising to plus 2 Sunday morning then falling to minus 8 Sunday evening.

Winds

Issued 09:04 AM EST 20 December 2025

Today Tonight and Sunday. Gale warning in effect. Wind southwest 15 knots backing to southeasterly 10 to 15 early this evening then increasing to southwest 15 to 25 near midnight. Wind increasing to west 25 to 35 Sunday morning then diminishing to northwest 15 to 25 Sunday evening.

Weather & Visibility

Issued 09:04 AM EST 20 December 2025

Today Tonight and Sunday. Scattered flurries tonight and Sunday morning. Visibility 1 mile or less in flurries.

Air temperature

Issued 09:04 AM EST 20 December 2025

Today Tonight and Sunday. Temperatures minus 6 rising to plus 2 Sunday morning then falling to minus 8 Sunday evening.

There is no ice forecast issued for this area.

Warnings (In effect)

Gale warning in effect

Cornwall to Montréal

Issued 09:04 AM EST 20 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Technical Marine Synopsis

Issued 3:00 AM EST 20 December 2025 Today Tonight and Sunday At 3:00 a.m. EST today low 966 mb located over western Labrador.
By 7:00 p.m. EST tonight departing low 950 mb located over
Labrador Sea.

At 3:00 a.m. EST today ridge located on a line north-south over
the eastern Great Lakes.
By 7:00 p.m. EST Sunday ridge located east of Newfoundland.

At 3:00 a.m. EST today low 994 mb located over southeastern
Manitoba.
By 7:00 p.m. EST Sunday low 1003 mb located over western
Newfoundland.

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